We're going to solve 1989 multiplied by 5104
1989 × 5104 = 5104 × (1989)
+ 5104 × 9 that is equal 45936
+ 5104 × 80 which equals 408320
+ 5104 × 900 producing 4593600
+ 5104 × 1000 what gives us 5104000

= 10151856
